DOWSIL 744 RTV Adhesive Sealant

Typical Properties (Cont.)

Property

Unit

Result

Tear Strength (Die B)

ppi N/cm

30 20

Unprimed Adhesion - Lap Shear to Aluminum

psi MPa kg/cm 2

430 3 296

Durometer Shore A Shelf Life at 25°C

37 12

months

UL Flammability Classification

NA

94-HB

Dow one-part moisture cure adhesives are generally cured at room temperature and in an environment of 30 to 80 percent relative humidity eliminating the need for curing ovens and the associated costs of energy and capital. Greater than 90 percent of full physical properties should be attained within 24 to 72 hours and varies according to product. Faster manufacturing throughput can be achieved since the adhesive and component can be handled in much shorter times of about 10 to 120 minutes, depending on the adhesive selected and the amount applied. These adhesives are not typically used in highly confined spaces or where a deep section cure is required as they generally cure from the exposed surface inward at a rate of 0.25 inch per seven days. Cure progresses from the outer exposed surface and is dependent on the moisture in the air. Working time is generally a few minutes to an hour for these products until a surface skin begins to form. Mild heat below 60°C (140°F) may be used to increase through-put by accelerating the cure. Dow silicone adhesives retain their original physical and electrical properties over a broad range of operating conditions which enhance the reliability of and service life of devices. The stable chemistry and versatile processing options of these adhesives offer benefits for a variety of device assembly needs from increasing component safety and reliability, reducing total cost or increasing the performance envelope of devices or modules. Underwriters Laboratory (UL) 94 recognition is based on minimum thickness requirements. Please consult the UL Online Certifications Directory for the most accurate certification information. All surfaces should be thoroughly cleaned and/or degreased with DOWSIL™ brand OS Fluids, naphtha, mineral spirits, methyl ethyl ketone (MEK) or other suitable solvent. Solvents such as acetone or isopropyl alcohol (IPA) do not tend to remove oils well, and any oils remaining on the surface may interfere with adhesion. Light surface abrasion is recommended whenever possible, because it promotes good cleaning and increases the surface area for bonding. A final surface wipe with acetone or IPA is also useful. Some cleaning techniques may provide better results than others; users should determine the best techniques for their particular applications.

Description

Preparing Surfaces

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